I am sure people will complain that this isn't a review site, etc etc etc, but I thought series 3 was hugely disappointing compared to the previous ones. Anybody agree/disagree?

I agree with you, but only because series 1 and 2 were both hilarious :) Series 3 is definitely not as good as the previous, but it is still FAR funnier than most modern 'comedy' shows out there today from the BBC/ITV.